NEW YORK — Target says it's fixed a technical issue that caused delays at registers in some U.S. stores, but stressed that the glitch was not related to a recent data security breach.

The retailer sent a message from its Twitter account late Sunday as shoppers took to social media to complain.

The Minneapolis company did not immediately respond Monday to questions from The Associated Press about what led to the incident or how many stores were affected.

The glitch comes as Target grapples with the fallout from a massive pre-Christmas security breach that compromised the credit cards and personal information of millions of customers and exposed a huge security flaw.

The breach has damaged Target's reputation with customers who are worried about their personal information. Last month, the retailer cut its annual profit outlook and first-quarter earnings fell 16 percent. The company's fourth-quarter profit fell 46 percent.

Target Corp. is overhauling its security and technology departments and its systems. In late April, it ousted its CEO and is now looking for a new leader.